Lab 2: Measurements and the Metric System
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1 Lab 2: Measurements and the Metric System The word measure means to determine the size, capacity, extent, volume, or quantity of anything, especially as determined by comparison with some standard or unit. To measure something you need a standard system of units and a device to measure it. Science uses the metric system, the newest version is called the Systeme International d Unites (SI) A. Introduction: The metric system is the measurement system used by scientists and used in everyday life in almost every other country in the world except in the United States. Most of the measurements in the United States use the English system of pounds, inches, and ounces. England abandoned the old fashion method long ago. The basic units of measurements include: meter (length); liter (volume); gram (weight); second (time) and Celsius or Kelvin (temperature). The metric system is based on units of ten. Below is a table with the units of the metric system. For example, there are 1,000 meters in a kilometer. Table 2 Prefixes Symbol Prefix Power of Ten Ordinary Notation U.S. Name Y yotta Z zetta E exa P peta T tera trillion G giga billion M mega million k kilo thousand h hecto* hundred da deka* ten one d deci* tenth c centi* hundredth m milli thousandth µ micro millionth n nano billionth p pico trillionth f femto a atto z zepto y yocto Reference: US Metric Association B. Unit Conversion 1
2 When you need to convert from one unit to a different unit you need to multiply by a conversion factor. Example 1: There are one thousand milliseconds in one second, so if you are asked to convert seconds into milliseconds you would: Make sure the units you are converting from always cancel out so all you are left with are the units that you are converting to. Example 2: If you have grams, how many milligrams is this? D. Relationship between English and Metric Units Length Volume Mass English Metric English Metric English Metric 1 in 2.54 cm 1 ft L 1 lb g in 1 m qt 1 L 1 oz g 1 mile km 1 gal L 1 dram g To convert from the English system to the metric or visa versa use the same method as you used above. Example: Your friend asks you if you want to run a 10 km race, how many miles would you be running? 2
3 E. Temperature Scientists use either the Celsius or the Kelvin scale. The Fahrenheit scale is used commonly in non-science settings in the United States. Both Celsius and Fahrenheit scales use degrees as units, the Kelvin scale units are called kelvins. The conversion factor for degrees F and C is: 9ºF = 5ºC. Water freezes at 0ºC or 32ºF or 273 kelvins. K = ºC +273 ºF = (ºC x 9ºF/5ºC) + 32 Example: It is 60ºF outside, what is the temp in ºC? 3
4 The basic unit of measurement for distance is the meter. Below are examples of distances using the metric system. 4
5 Weights The basic unit of measurement for weight is the gram. Below are examples of weights using the metric system. 5
6 Procedure 1: Measuring length using the metric system Step 1: Using the metric rulers, measure following items. Step 2: Record the length in the space provided below. Length of binder paper (cm) Length of binder paper (mm) Width of binder paper (cm) Width of binder paper (mm) Width of your outstretched hand (cm) Width of your outstretched hand (m) Length of your pencil (cm) Length of your pencil (mm) Width of lab bench (cm) Width of lab bench (m) Length of your shoe (cm) Length of your shoe (m) Procedure 2: Measuring weights using the metric system Step 1: First estimate the weight of the object you are given, record the estimated weight in the table below. Step 2: Using the triple beam balance, measure the following items and record their weights below, remember to include units. Step 2: Weigh the empty weigh boat, record the weight below. Step 3: Using the pipet, add 1 ml of water to the weigh boat. Note: The instructor will show you how to use the pipets Step 4: Weigh the weigh boat with the 1 ml of water, record the weight below. Object Estimate weight (g) Actual Weight (g) Actual Weight (kg) Paper clip Pencil Tennis ball Metal weight Empty weigh boat Weigh boat + 1 ml water 1 ml water 6
7 Procedure 3: Measuring volumes Step 1: First estimate the number of drops of water are in 1 ml of water. Record your guess in the table below Step 2: Fill the graduated cylinder to the 1 ml line using a disposable dropper pipette, counting the drops. Step 3: Record the number of drops in the table below. Step 4: Keep adding drops of water to the 2 ml line, record number below Step 5: Keep adding drops of water to the 3 ml line, record number below Step 6: Take the average of the three measurements Est # drops Counted # drops Counted # drops Counted # drops Avg Procedure 4: Measuring temperature Step 1: Using the Celsius thermometer, measure the temperature of the room and the water baths Step 2: Record the temperature below in Celsius, Then calculate the temp in Fahrenheit and Kelvin. Room Temp Water bath A (ice) Water bath B (boiling) Celsius Fahrenheit Kelvin 7
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